#include<stdio.h>

#define price 10;

int x = 3 ;
int y = 4 ;

int MyFunction()
{
extern int x;
extern int y;

x = 1;
y = 2;
return x + y;
}

int main(void)
{
int jg;
jg = MyFunction();
printf("这里是结果=%d",jg);
/*extern int x;
extern int y;*/

return 0;
}